We have 5 types of timing Idler pulleys;1. 20tooth width 6mm bore 3mm With Teeth;2. 20tooth width 6mm bore 5mm With Teeth;3. 20tooth width 6mm bore 4mm Without Teeth;4. 20tooth width 6mm bore 3mm Without Teeth;5. 20tooth width 6mm bore 5mm Without Teeth;please make sure what is type of your choice, check it again when you pay it,(T: teeth W: width B: bore With T:With Teeth Without T:Without Teeth)Bore Diameter: 3/4/5mmModel number : 2GTTeeth :20 TeethWidth:6mmPackage Included:1PC